diff --git a/src/asm/main.cpp b/src/asm/main.cpp
index 807d3412..e063250b 100644
--- a/src/asm/main.cpp
+++ b/src/asm/main.cpp
@@ -289,7 +289,7 @@ static void parseArg(int ch, char *arg) {
 		if (localOptions.stateFileSpecs.find(name) != localOptions.stateFileSpecs.end()) {
 			warnx("Overriding state file \"%s\"", name);
 		}
-		localOptions.stateFileSpecs.emplace(name, std::move(features));
+		localOptions.stateFileSpecs[name] = std::move(features);
 		break;
 	}
 
diff --git a/test/asm/state-override.asm b/test/asm/state-override.asm
new file mode 100644
index 00000000..67eb1cb3
--- /dev/null
+++ b/test/asm/state-override.asm
@@ -0,0 +1,2 @@
+DEF s EQUS "hello"
+DEF n EQU 42
diff --git a/test/asm/state-override.err b/test/asm/state-override.err
new file mode 100644
index 00000000..b093960c
--- /dev/null
+++ b/test/asm/state-override.err
@@ -0,0 +1 @@
+warning: Overriding state file "-"
diff --git a/test/asm/state-override.flags b/test/asm/state-override.flags
new file mode 100644
index 00000000..0d93cd1d
--- /dev/null
+++ b/test/asm/state-override.flags
@@ -0,0 +1 @@
+-s equs:- -s equ:-
diff --git a/test/asm/state-override.out b/test/asm/state-override.out
new file mode 100644
index 00000000..421441a0
--- /dev/null
+++ b/test/asm/state-override.out
@@ -0,0 +1,4 @@
+; File generated by rgbasm
+
+; Numeric constants
+def n equ $2a